Construction of an rAAV Producer Cell Line through Synthetic Biology.

Abstract

Recombinant adeno-associated viruses (rAAV) are important gene delivery vehicles for gene therapy applications. Their production relies on plasmid transfection or virus infection of producer cells, which pose a challenge in process scale-up. Here, we describe a template for a transfection-free, helper virus-free rAAV producer cell line using a synthetic biology approach. Three modules were integrated into HEK293 cells including an rAAV genome and multiple inducible promoters controlling the expression of AAV Rep, Cap, and helper coding sequences. The synthetic cell line generated infectious rAAV vectors upon induction. Independent control over replication and packaging activities allowed for manipulation of the fraction of capsid particles containing viral genomes, affirming the feasibility of tuning gene expression profiles in a synthetic cell line for enhancing the quality of the viral vector produced. The synthetic biology approach for rAAV production presented in this study can be exploited for scalable biomanufacturing.